If the surface area of a sphere is increased by a factor of 3, by what factor does the radius of the sphere change?
A. 1.14
B. 1.73
C. 2.00
D. 2.24
B. 1.73
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Synchrotron radiation is produced
a. in planetary nebulae. b. by red dwarfs. c. massive stars as their iron core collapses. d. in supernova remnants. e. neutrinos
What gives the most direct view into the Sun's core?
What will be an ideal response?
A diverging lens will be prescribed by the eye doctor to correct which of the following?
a. myopia b. presbyopia c. hyperopia d. astigmatism
A rock is sinking to the bottom of the lake. The buoyant force is greater at point
1) A. 2) B. 3) C. 4) equal at all levels. This follows from the fact that 5) pressure increases with depth. 6) the same weight of water is displaced at any depth. 7) the water is appreciably more compressed with increasing depth. 8) position B provides a moderate answer, between the extremes.